SIMBAD references

1995BAAS...27S.866P - Bull. American Astron. Soc., 27, 866 (1995)

CCD narrowband photometry of the Helix Nebula (NGC 7293).

PAPAMASTORAKIS J., XILOURIS K.M. and PALAIOLOGOU E.V.

Journal keyword(s):

Simbad objects: 1

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